"A method of determining the minimum detectable power density incident at the receiving antenna of a UHF receiver is proposed. The minimum detectable power density is the power density required to produce a signal-to-noise ratio of unity in the output of the receiver. The proposed method includes the receiving antenna impedance, the necessary connecting transmission lines, and the receiver impedance.
It is shown that an error in the antenna directivity will produce a significant error in the overall sensitivity of a receiving system. Since the directivity is the most difficult system variable to determine experimentally, it is probably the limiting factor in the proposed method.
It is shown that the methods presently used to evaluate the receiver system sensitivity are a function of antenna directivity, effective temperature of the receiving antenna, and a term called noise factor. All of these parameters produce considerable error in the experimental evaluation of the sensitivity. It is for this reason that a better method of determining the overall receiving system sensitivity is desirable.
The proposed method includes the receiving antenna directivity but does not include the effective temperature of the antenna or the noise factor of the receiver. Elimination of these two variables should improve the accuracy of determining the overall sensitivity. The sensitivity is evaluated in terms of the receiving system variables including the receiving antenna and the receiver. These variables can be measured with greater accuracy than those of the methods presently used. The method is straightforward and can be accomplished in the field by technicians with reasonable accuracy and within a reasonable length of time"--Summary, pages 2-3.
Skitek, G. G. (Gabriel G.)
Pauls, Franklin B., 1911-1996
Lee, Ralph E., 1921-2010
Nolte, Roger E.
Electrical and Computer Engineering
M.S. in Electrical Engineering
Missouri School of Mines and Metallurgy
© 1960 James Henry Johnson, All rights reserved.
Thesis - Open Access
Impedance (Electricity) -- Mathematical models
Signal processing -- Digital techniques
Radio -- Transmitters and transmission
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Electronic OCLC #
Link to Catalog Record
Johnson, James Henry, "An experimental investigation of receiver system sensitivity" (1960). Masters Theses. 5571.